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VM244: Diagnostic Methods for the Comprehensive Health Assessment of the Long-Spined Sea Urchin, Diadema antillarum

Figure H7-1. The gill. (a) Low-power magnification view of the gill. (b) Aggregates of coelomocytes found in the lumen of hemal vessel. (c) Brown pigments (i.e., melanized hemocytes) surround needle-like objects (arrows) exhibiting granuloma-like appearance in the lumen of hemal vessels. HV = hemal vessel.

Credit: Jan Landsberg and Yasunari Kiryu, FWC/FWRI